awesome!
i got it up to 135 rpms and it was still running smooth!
I am really bad at linkages and stuff; so bad that my best linkage is probably the one in my dump truck for the door at the back to open (kinda sad )

Hey, I was at College when I saw the vid, it blewe my mind, so I asked one of my friends and he said "Yeah, he uses stabilizers to keep it from falling over" (He is a robotics student) and I was like, wow, Tank IS KINNNG! Ive been trying to do one of these myself, I just succeeded yesterday.